Hydraulic fluid energy recovery system for work
First Claim
1. A hydraulic fluid energy recovery system for a work machine equipped with a hydraulic pump, a hydraulic actuator for driving the work machine, an operating device for operating the hydraulic actuator, and a regenerating device for recovering a return fluid flowing back from the hydraulic actuator, the hydraulic fluid energy recovery system comprising:
- a fluid line for allowing the return fluid from the hydraulic actuator to flow through the line;
a section for branching the fluid line into a plurality of fluid lines;
a recovery circuit serving as one of the branch fluid lines, the recovery circuit including the regenerating device;
a discharge circuit serving as the other of the branch fluid lines, the discharge circuit being for discharging the return fluid to a tank;
a flow control device disposed in the discharge circuit, the flow control device being adapted to control a flow rate of the return fluid;
an operation amount detector for detecting the operation amount on the operating device;
a discharge flow rate computing unit for acquiring a detection signal from the operation amount detector and calculating a target discharge flow rate of the return fluid flowing through the discharge circuit;
a regeneration flow rate computing unit for acquiring the detection signal from the operation amount detector and calculating a target regeneration flow rate of the return fluid flowing through the recovery circuit; and
a control device for controlling the flow control device according to the target discharge flow rate and also controlling the regenerating device according to the target regeneration flow rate, wherein;
the discharge flow rate computing unit calculates the target discharge flow rate that, increases according to the operation amount immediately after a start of the operations on the operating device, and slowly decreases with an elapse of time; and
the regeneration flow rate computing unit calculates the target regeneration flow rate set to be smaller than the target discharge flow rate immediately after the start of the operations on the operating device, and slowly increases with an elapse of time according to the operation amount.
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Accused Products
Abstract
Provided is a hydraulic fluid energy recovery system for a work machine equipped with a hydraulic pump, a hydraulic actuator for driving the work machine, an operating device for operating the hydraulic actuator, and a regenerating device for recovering a return fluid flowing back from the hydraulic actuator. The hydraulic fluid energy recovery system includes: a fluid line for allowing the return fluid from the hydraulic actuator to flow through the line; a section for branching the fluid line into a plurality of fluid lines; a recovery circuit that serves as one of the branch fluid lines and includes the regenerating device; a discharge circuit that serves as the other of the branch fluid lines and discharges the return fluid to a tank; a flow control device disposed in the discharge circuit so as to be able to control a flow rate of the return fluid; an operation amount detector for detecting the operation amount on the operating device; and a control device configured to acquire the operation amount detected by the operation amount detector, calculate a target discharge flow rate of the return fluid flowing through the discharge circuit, and calculate a target regeneration flow rate of the return fluid flowing through the recovery circuit, the control device thereby controlling the flow control device according to the target discharge flow rate and also controlling the regenerating device according to the target regeneration flow rate.
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Citations
16 Claims
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1. A hydraulic fluid energy recovery system for a work machine equipped with a hydraulic pump, a hydraulic actuator for driving the work machine, an operating device for operating the hydraulic actuator, and a regenerating device for recovering a return fluid flowing back from the hydraulic actuator, the hydraulic fluid energy recovery system comprising:
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a fluid line for allowing the return fluid from the hydraulic actuator to flow through the line; a section for branching the fluid line into a plurality of fluid lines; a recovery circuit serving as one of the branch fluid lines, the recovery circuit including the regenerating device; a discharge circuit serving as the other of the branch fluid lines, the discharge circuit being for discharging the return fluid to a tank; a flow control device disposed in the discharge circuit, the flow control device being adapted to control a flow rate of the return fluid; an operation amount detector for detecting the operation amount on the operating device; a discharge flow rate computing unit for acquiring a detection signal from the operation amount detector and calculating a target discharge flow rate of the return fluid flowing through the discharge circuit; a regeneration flow rate computing unit for acquiring the detection signal from the operation amount detector and calculating a target regeneration flow rate of the return fluid flowing through the recovery circuit; and a control device for controlling the flow control device according to the target discharge flow rate and also controlling the regenerating device according to the target regeneration flow rate, wherein; the discharge flow rate computing unit calculates the target discharge flow rate that, increases according to the operation amount immediately after a start of the operations on the operating device, and slowly decreases with an elapse of time; and the regeneration flow rate computing unit calculates the target regeneration flow rate set to be smaller than the target discharge flow rate immediately after the start of the operations on the operating device, and slowly increases with an elapse of time according to the operation amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification